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Results of inter-rater agreement testing
| Item | Unweighted kappa (95% CI) | % agreement | Weighted kappa (95% CI) | % agreement |
| 1. Representativeness of the sampling frame | 0.60 (0.48 to 0.68) | 74.7 | 0.63 (0.54 to 0.73) | 83.1 |
| 2. Representativeness of the responders | 0.69 (0.59 to 0.70) | 81.9 | 0.71 (0.67 to 0.85) | 90.3 |
| 3. Measurement of the condition | 0.28 (0.10 to 0.73) | 89.2 | 0.32 (−0.04 to 0.63) | 93.4 |
